Chests used in Barossa festival (5)

I believe the answer is:

safes

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'chests' is the definition.
The answer and definition can be both man-made objects as well as being plural nouns.
Perhaps you can see an association between them that I can't see?

'in barossa festival' is the wordplay.
'in' says the answer is hidden in the clue.
'SAFES' is hidden within 'barossa festival'.

'used' acts as a link.

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.

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